FINOCJ previously posted:
"Did you use GL-5? Novak has this to say:
The factory manuals call for 75W90 GL-3 gear oil for the AX15 transmission. This fluid is essentially obsolete; superseded by GL4, then GL5. However, many GL5 fluids have friction modifiers that are not compatible with synchronizers, so make sure to check for compatibility.
The old transmission and TCs found in my old jeeps have this issue as well...I found StaLube gear oil from NAPA that is good for the yellow metal synchronizers and blocking rings seems to work really well...."
What he said. I made the mistake of changing my oil. Did not know that I needed to use a specific oil. Once I bought the correct oil (Redline MT-90 not cheap!
) and changed it out it was all good. I was lucky that there wasn't too much damage to the synchro's. It's been good for 4 years now.